STw4102

Application schematics

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5.2

Charge currents higher than 1 Amp

One-time programming (OTP) options offer the ability to use an external power device or an

external sense resistor to handle charge currents higher than 1 A from the wall adapter.

These OTP options are set by STMicroelectronics at factory level.

Figure 17.

Charge using external power devices

Table 9.

Component list for external power devices

Name

Typ. value

Tolerance

Comments

8k to 12k

1%

Main charge current setting

200m

Ω

1%

External current sense resistor

T1 or

M1 + D1

STT818B

STS2DPFS20V

PNP transistor

PMOS transistor with Schottky diode

Indicator LED

battery voltage

32kHz

Rset

Rcg

C1

StandBy

C2

Reset

Rs

STw4102

VOUT

SENSE

BATT

BATTSENSE

ISET

CVIS

C32KHZ

STDBY

ICG+

ICG-

GND

RESETN

SDA

SCL

VIO

LDOFB

LDODRV

CVREF

EOCHG

PWRDETECTN

MAIN

USBPWR

DRIVER

IO voltage

C3

T1

D1

M1

to power

management

TEST